Add docker to dependabot #1900

Job	Run time
Docker CLI tests (ubuntu-latest)	4m 51s
bazel	1m 24s
Tests (ubuntu-latest, 8)	18m 21s
Tests (ubuntu-latest, 17)	13m 7s
Tests (ubuntu-latest, 11)	18m 40s
check	4m 53s
Tests (ubuntu-latest, 21)	7m 51s
bazel_aspect	3m 9s
Maven tests (8)	2m 42s
Maven tests (21)	2m 52s
Maven tests (11)	2m 45s
Maven tests (17)	2m 43s
	1h 23m 18s

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